package com.stu.mall.cart.interceptor;


import cn.hutool.core.lang.UUID;
import com.stu.mall.cart.to.UserInfoTo;
import com.stu.mall.common.constant.AuthServerConstant;
import com.stu.mall.common.constant.CartConstant;
import com.stu.mall.common.vo.MemberResponseVo;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


/**
 * @Description: 在执行目标方法之前，判断用户的登录状态.并封装传递给controller目标请求
 * @Created: with IntelliJ IDEA.
 * @author: admin
 * @createTime: 2020-06-30 17:31
 **/
@Slf4j
public class CartInterceptor implements HandlerInterceptor {


    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();

    /***
     * 目标方法执行之前
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession();
        UserInfoTo userInfoTo = new UserInfoTo();
        MemberResponseVo memberResponseVo = (MemberResponseVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (memberResponseVo != null) { //用户登录
            userInfoTo.setUserId(memberResponseVo.getId());
        }

        Cookie[] cookies = request.getCookies();
        if (cookies != null && cookies.length > 0) {
            for (Cookie cookie : cookies) {
                //user-key
                String name = cookie.getName();
                if (CartConstant.TEMP_USER_COOKIE_NAME.equalsIgnoreCase(name)) {
                    userInfoTo.setUserKey(cookie.getValue());
                    userInfoTo.setTempUser(true);
                }
            }
        }

        //不管用户有没登录，都分配一个临时用户
        if (StringUtils.isEmpty(userInfoTo.getUserKey())) {
            userInfoTo.setUserKey(UUID.randomUUID().toString());
        }


        //在目标方法执行前
        threadLocal.set(userInfoTo);
        return true;
    }


    /**
     * 业务执行之后，分配临时用户来浏览器保存
     *
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = threadLocal.get();
        if (!userInfoTo.getTempUser()) {
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
            cookie.setDomain("gmall.com");
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT); //单位是秒
            response.addCookie(cookie);
        }

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
